Let us talk about Herd Immunity and its challenges for COVID-19-by Dr Harold Gunatillake Transcript; Herd immunity is defined as the resistance to the spread of an infectious disease within a population that is based on pre-existing immunity of a high proportion of individuals from previous infection or vaccination. “The level of vaccination needed to achieve herd immunity varies by disease.” The chances are that herd immunity is far fledged when the adapted immune response lasts only for a few months, as in the case of Covid-19. Cows, buffaloes protect their growing young ones well in the herd to prevent attacks from predators. Humans do not need this herd immunity protection of the young ones, but the idea or the concept suits well when most people are vaccinated against a current disease process, the minority of people get the protection without being immunized through passive immune process. The immunologists call ...

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Health Silk Road or Pandemic Silk Road? By Gajalakshmi Paramasivam The weather was good today and I decided to take a walk along Coogee Beach. I noticed many without masks and also many seated on the benches. Last week I was informed by the Police that sitting down was against the rules. I thought about this and tried to work out the impact of our respective actions on the spread of the virus. As lay persons, most of us take the word of those in authority as right – until proven otherwise. Given that I am not a medical expert – I took the word of the Police as that of the government. It is my belief that any law, made in a ‘free’ environment as per the conscience of the law maker would work for her / his group and the value would spread itself exponentially. Hence Universal Franchise. Then ...

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Railways of Ceylon and the old world – Compiled by Raj Gonsalkorale   Information and photographs sourced from the Wikipedia The Sri Lanka Railway, originally known as Ceylon Government Railways, was conceived in the 1850s and service began in 1864 with the construction of the main line from Colombo to Ambepussa, 54 kilometers to the east. The Railway was initially built in Ceylon with the intension of transportation of Tea and Coffee from hill country to Colombo. For many years, transporting such goods was the main purpose and the source of income on the line. With time and population growth, however, passenger traffic increased. In the 1960s, passenger traffic overtook freight as the main source of revenue. The railway is now primarily engaged in the transport of passengers, especially commuters to and from Colombo, thereby reducing road congestion. The first train that ran on 27 December 1864, was officially opened for ...

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